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Fair Value Measurements--Level 3 Rollforward (Details) (Recurring Fair Value Measurements, Significant unobservable inputs (Level 3), Derivative, USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Recurring Fair Value Measurements | Significant unobservable inputs (Level 3) | Derivative
   
Level 3 Rollforward    
Beginning balance $ 3,622 $ 26,231
Realized and unrealized losses included in non-hedge derivative losses (70,048) 15,614
Purchases 1,220 664
Settlements paid (received) 10,254 (11,556)
Ending balance (54,952) 30,953
(Losses) gains relating to instruments still held at the reporting date included in non-hedge derivative (losses) gains for the period $ (63,617) $ 18,651